Nonmagnetic impurity perturbation to the quasi-two-dimensional quantum helimagnetLiCu2O2 Academic Article uri icon

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abstract

  • A complete phase diagram of Zn substituted quantum quasi-two-dimensional helimagnet LiCu2O2 has been presented. Helical ordering transition temperature (T_h) of the original LiCu2O2 follows finite size scaling for less than ~ 5.5% Zn substitution, which implies the existence of finite helimagnetic domains with domain boundaries formed with nearly isolated spins. Higher Zn substitution > 5.5% quenches the long-range helical ordering and introduces an intriguing Zn level dependent magnetic phase transition with slight thermal hysteresis and a universal quadratic field dependence for T_c (Zn > 0.055,H). The magnetic coupling constants of nearest-neighbor (nn) J1 and next-nearest-neighbor (nnn) J2 (alpha=J2/J1) are extracted from high temperature series expansion (HTSE) fitting and N=16 finite chain exact diagonalization simulation. We have also provided evidence of direct correlation between long-range helical spin ordering and the magnitude of electric polarization in this spin driven multiferroic material.

authors

  • Hsu, HC
  • Lin, J-Y
  • Lee, WL
  • Chu, M-W
  • Imai, Takashi
  • Kao, YJ
  • Hu, CD
  • Liu, HL
  • Chou, FC

publication date

  • September 29, 2010